Dodge Ram Truck 1500-2500-3500. Manual — part 431
LAMP-FOG
REMOVAL
BULB
CAUTION: Do not contaminate the bulb glass by touching it with your fingers or by allowing it to contact
other oily surfaces. Shortened bulb life will result.
1. Disconnect and isolate the battery negative cable.
2. Reach under and behind the front fascia to access
the front fog lamp housing (1) on the back of the
front bumper (4).
3. Disconnect the wire harness connector (3) from the
fog lamp bulb (2).
4. Firmly grasp the bulb on the back of the housing
and rotate it counterclockwise about 30 degrees to
unlock it.
5. Pull the bulb straight out from the keyed opening in
the housing.
LAMP
1. Disconnect and isolate the battery negative cable.
2. Reach under and behind the front bumper to
access and disconnect the headlamp and dash
wire harness connector (3) from the front fog lamp
socket connector.
3. Remove the three screws (1) that secure the front
fog lamp housing (2) to the front bumper support.
4. Remove the front fog lamp from behind the front
bumper.
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LAMPS/LIGHTING - EXTERIOR - SERVICE INFORMATION
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INSTALLATION
BULB
CAUTION: Always use the correct bulb size and type for replacement. An incorrect bulb size or type may
overheat and cause damage to the lamp, the socket and/or the lamp wiring.
CAUTION: Do not contaminate the bulb glass by touching it with your fingers or by allowing it to contact
other oily surfaces. Shortened bulb life will result.
1. Align the fog lamp bulb (2) with the keyed opening
on the back of the front fog lamp housing (1).
2. insert the bulb into the housing until it is firmly
seated.
3. Rotate the bulb clockwise about 30 degrees to lock
it into place. The bulb connector receptacle should
be pointed straight downward.
4. Reconnect the wire harness connector (3) to the
bulb.
5. Reconnect the battery negative cable.
LAMP
1. Reach under and behind the front bumper to posi-
tion the front fog lamp (2) to the front bumper sup-
port.
2. Install and tighten the three screws (1) that secure
the front fog lamp housing to the bumper support.
Tighten the screws to 5 N·m (40 in. lbs.).
3. Reconnect the headlamp and dash wire harness
connector (3) to the front fog lamp socket connec-
tor.
4. Reconnect the battery negative cable.
5. Confirm proper front fog lamp alignment. (Refer to
8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR -
STANDARD
PROCEDURE
-
FRONT
LAMP
AIMING).
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LAMPS/LIGHTING - EXTERIOR - SERVICE INFORMATION
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RELAY-FOG LAMP
DESCRIPTION
The front fog lamp relay is a conventional International
Standards Organization (ISO) micro relay. Relays con-
forming to the ISO specifications have common phys-
ical dimensions, current capacities, terminal patterns,
and terminal functions. The relay is contained within a
small, rectangular, molded plastic housing and is con-
nected to all of the required inputs and outputs
through five integral male spade-type terminals that
extend from the relay base plate.
The front fog lamp relay is located in the Power Dis-
tribution Center (PDC) in the engine compartment
near the battery. Refer to the layout label on the
underside of the PDC cover for specific relay cavity
assignment information. The front fog lamp relay can-
not be adjusted or repaired and, if faulty or damaged,
the unit must be replaced.
OPERATION
The front fog lamp relay is an electromechanical switch that uses a low current input from the Front Control Module
(FCM) (also referred to as the Integrated Power Module/IPM) to control a high current output to the front fog lamps.
Within the relay are an electromagnetic coil, a movable contact and two fixed contact points. A resistor is connected
in parallel with the coil, and helps to dissipate voltage spikes and electromagnetic interference that can be gener-
ated as the field of the relay coil collapses.
The movable common supply contact point is held against the fixed normally closed contact point by spring pres-
sure. When the relay coil is energized, an electromagnetic field is produced by the coil windings. This field draws
the movable contact away from the normally closed contact, and holds it against the normally open contact. When
the relay coil is de-energized, spring pressure returns the movable contact back against the normally closed contact.
The inputs and outputs of the front fog lamp relay include:
•
Common Supply Terminal (30) - The common feed terminal is connected to a fused B(+) circuit at all times.
•
Coil Ground Terminal (85) - The coil ground terminal is connected to a fused B(+) circuit at all times.
•
Coil Battery Terminal (86) - The coil battery terminal is connected to a control output of the FCM through a
fog lamp relay control circuit. The FCM controls front fog lamp operation by controlling a ground path through
this circuit.
•
Normally Open Terminal (87) - The normally open terminal is connected to the front fog lamps through a fog
lamp relay output circuit and provides battery voltage to the front fog lamps whenever the relay is energized.
•
Normally Closed Terminal (87A) - The normally closed terminal is not connected to any circuit in this appli-
cation, but will have battery voltage present whenever the relay is de-energized.
The front fog lamp relay can be diagnosed using conventional diagnostic tools and methods. Refer to the appro-
priate wiring information.
FRONT LAMP UNIT
STANDARD PROCEDURE
FRONT LAMP UNIT MOISTURE CLEARING
Some moisture accumulation inside a vented front lamp unit is normal. This normal moisture will appear as a fog-
ging on the inside of the lamp lens, similar to the fog that sometimes appears on the inside of a windshield. This
moisture may be removed by activating the headlamps on high beam for 15 minutes.
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If water droplets larger than 1 millimeter in size have accumulated on the inside of the lamp lens, the front lamp unit
should be replaced.
REMOVAL
BULB - PARK/TURN SIGNAL
NOTE: The front park/turn signal bulb also pro-
vides illumination for the front side marker lamp
function.
1. Disconnect and isolate the battery negative cable.
2. Remove the front lamp unit (1) from the front
fender. (Refer to 8 - ELECTRICAL/LAMPS/LIGHT-
ING
-
EXTERIOR/FRONT
LAMP
UNIT
-
REMOVAL).
3. Firmly grasp the park/turn signal bulb socket (2) on
the back of the front lamp unit housing and rotate it
counterclockwise about 30 degrees to unlock it.
4. Pull the socket and bulb straight out from the
keyed opening in the housing.
5. Pull the base of the bulb (2) straight out of the
socket (1).
BULB - HEADLAMP
CAUTION: Do not contaminate the bulb glass by touching it with your fingers or by allowing it to contact
other oily surfaces. Shortened bulb life will result.
DR/DH
LAMPS/LIGHTING - EXTERIOR - SERVICE INFORMATION
8L - 133
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